Recommended update for grub2

This update for grub2 fixes the following issues:

- Do not ignore settings in variables GRUB_DISABLE_LINUX_UUID and GRUB_DEVICE. (bsc#971867)
This update was imported from the SUSE:SLE-12-SP1:Update update project.

Fixed bugs
bnc#971867
cmdline is missing actual uuid of rootfs
Selected Binaries
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